Sharpener



FIG. 1 is a top perspective view of a sharpener showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a bottom perspective view thereof.

The broken lines depict portions of the sharpener in which the design is embodied that are not considered part of the claimed design. 

CLAIM The ornamental design for a sharpener, as shown and described. 